I realize different women have different opinons on whether TCO is a problem or not, I was just trying to make the point that the same model bike in different sizes isn't always the same bike. This is particularly true in the smaller sizes where the frame geometires can vary by quite a bit. So, if she LOVES the handling of the 52, she may prefer to be fit to it with whatever stem adjustments are required, than going with the 50 which will have a shorter headtube. You have to be careful, cuz if you read a review of how a bike handles, unless you are going to ride it in the same frame size, the geometry may actually be quite different. I have found trail to be one of the major differences between diff. frame sizes, but its effect on how a bike handles is huge. Also, how your body balances over the bike effects handling, so again, if she loved the 52 it indeed may be the best for her, or not, we don't know which is why a professional fitter needs to look at her on the 52 and decide if its the perfect frame size or if he/she thinks the 50 would be better. And then she needs to find out *if* the 50 cm frame has TCO, and how *she* feels about that.